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/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file fontcache.h Functions to read fonts from files and cache them. */
#ifndef FONTCACHE_H
#define FONTCACHE_H
#include "string_type.h"
#include "spritecache.h"
/** Glyphs are characters from a font. */
typedef uint32 GlyphID;
static const GlyphID SPRITE_GLYPH = 1U << 30;
/** Font cache for basic fonts. */
class FontCache {
private:
static FontCache *caches[FS_END]; ///< All the font caches.
protected:
FontCache *parent; ///< The parent of this font cache.
const FontSize fs; ///< The size of the font.
int height; ///< The height of the font.
int ascender; ///< The ascender value of the font.
int descender; ///< The descender value of the font.
int units_per_em; ///< The units per EM value of the font.
static int GetDefaultFontHeight(FontSize fs);
public:
FontCache(FontSize fs);
virtual ~FontCache();
/**
* Get the FontSize of the font.
* @return The FontSize.
*/
inline FontSize GetSize() const { return this->fs; }
/**
* Get the height of the font.
* @return The height of the font.
*/
inline int GetHeight() const { return this->height; }
/**
* Get the ascender value of the font.
* @return The ascender value of the font.
*/
inline int GetAscender() const { return this->ascender; }
/**
* Get the descender value of the font.
* @return The descender value of the font.
*/
inline int GetDescender() const{ return this->descender; }
/**
* Get the units per EM value of the font.
* @return The units per EM value of the font.
*/
inline int GetUnitsPerEM() const { return this->units_per_em; }
/**
* Get the nominal font size of the font.
* @return The nominal font size.
*/
virtual int GetFontSize() const { return this->height; }
/**
* Get the SpriteID mapped to the given key
* @param key The key to get the sprite for.
* @return The sprite.
*/
virtual SpriteID GetUnicodeGlyph(WChar key) = 0;
/**
* Map a SpriteID to the key
* @param key The key to map to.
* @param sprite The sprite that is being mapped.
*/
virtual void SetUnicodeGlyph(WChar key, SpriteID sprite) = 0;
/** Initialize the glyph map */
virtual void InitializeUnicodeGlyphMap() = 0;
/** Clear the font cache. */
virtual void ClearFontCache() = 0;
/**
* Get the glyph (sprite) of the given key.
* @param key The key to look up.
* @return The sprite.
*/
virtual const Sprite *GetGlyph(GlyphID key) = 0;
/**
* Get the width of the glyph with the given key.
* @param key The key to look up.
* @return The width.
*/
virtual uint GetGlyphWidth(GlyphID key) = 0;
/**
* Do we need to draw a glyph shadow?
* @return True if it has to be done, otherwise false.
*/
virtual bool GetDrawGlyphShadow() = 0;
/**
* Map a character into a glyph.
* @param key The character.
* @return The glyph ID used to draw the character.
*/
virtual GlyphID MapCharToGlyph(WChar key) = 0;
/**
* Read a font table from the font.
* @param tag The of the table to load.
* @param length The length of the read data.
* @return The loaded table data.
*/
virtual const void *GetFontTable(uint32 tag, size_t &length) = 0;
/**
* Get the native OS font handle, if there is one.
* @return Opaque OS font handle.
*/
virtual const void *GetOSHandle()
{
return nullptr;
}
/**
* Get the name of this font.
* @return The name of the font.
*/
virtual const char *GetFontName() = 0;
/**
* Get the font cache of a given font size.
* @param fs The font size to look up.
* @return The font cache.
*/
static inline FontCache *Get(FontSize fs)
{
assert(fs < FS_END);
return FontCache::caches[fs];
}
/**
* Check whether the font cache has a parent.
*/
inline bool HasParent()
{
return this->parent != nullptr;
}
/**
* Is this a built-in sprite font?
*/
virtual bool IsBuiltInFont() = 0;
};
/** Get the SpriteID mapped to the given font size and key */
static inline SpriteID GetUnicodeGlyph(FontSize size, WChar key)
{
return FontCache::Get(size)->GetUnicodeGlyph(key);
}
/** Map a SpriteID to the font size and key */
static inline void SetUnicodeGlyph(FontSize size, WChar key, SpriteID sprite)
{
FontCache::Get(size)->SetUnicodeGlyph(key, sprite);
}
/** Initialize the glyph map */
static inline void InitializeUnicodeGlyphMap()
{
for (FontSize fs = FS_BEGIN; fs < FS_END; fs++) {
FontCache::Get(fs)->InitializeUnicodeGlyphMap();
}
}
static inline void ClearFontCache()
{
for (FontSize fs = FS_BEGIN; fs < FS_END; fs++) {
FontCache::Get(fs)->ClearFontCache();
}
}
/** Get the Sprite for a glyph */
static inline const Sprite *GetGlyph(FontSize size, WChar key)
{
FontCache *fc = FontCache::Get(size);
return fc->GetGlyph(fc->MapCharToGlyph(key));
}
/** Get the width of a glyph */
static inline uint GetGlyphWidth(FontSize size, WChar key)
{
FontCache *fc = FontCache::Get(size);
return fc->GetGlyphWidth(fc->MapCharToGlyph(key));
}
static inline bool GetDrawGlyphShadow(FontSize size)
{
return FontCache::Get(size)->GetDrawGlyphShadow();
}
/** Settings for a single freetype font. */
struct FreeTypeSubSetting {
std::string font; ///< The name of the font, or path to the font.
uint size; ///< The (requested) size of the font.
bool aa; ///< Whether to do anti aliasing or not.
const void *os_handle = nullptr; ///< Optional native OS font info. Only valid during font search.
};
/** Settings for the freetype fonts. */
struct FreeTypeSettings {
FreeTypeSubSetting small; ///< The smallest font; mostly used for zoomed out view.
FreeTypeSubSetting medium; ///< The normal font size.
FreeTypeSubSetting large; ///< The largest font; mostly used for newspapers.
FreeTypeSubSetting mono; ///< The mono space font used for license/readme viewers.
};
extern FreeTypeSettings _freetype;
void InitFreeType(bool monospace);
void UninitFreeType();
bool HasAntialiasedFonts();
#endif /* FONTCACHE_H */
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